Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b6319beb authored by Xiaozhe Shi's avatar Xiaozhe Shi Committed by Abhijeet Dharmapurikar
Browse files

power: qpnp-fg: add device tree support for batt-therm coefficients 



The fuel gauge uses some coefficients to do battery thermistor
conversions. These values can vary depending on the thermistor and board
characteristics.

Add support for a device tree property qcom,thermal-coefficients to the
fuel gauge driver to allow users to configure these values.

CRs-Fixed: 713392
Change-Id: Ief2f75cbd5df28245baccdde9960f30d197d413c
Signed-off-by: default avatarXiaozhe Shi <xiaozhes@codeaurora.org>
parent aa4cb467

Documentation/devicetree/bindings/power/qpnp-fg.txt

+4 −0
Original line number Diff line number Diff line
@@ -35,6 +35,10 @@ Parent node optional properties: 
- qcom,cold-bat-decidegc:		Cold battery temperature in decidegC.

- qcom,ext-sense-type:			Current sense channel used by the FG.

					Set this to use external rsense.

- qcom,thermal-coefficients:		Byte array of thermal coefficients for

					reading battery thermistor. This should

					be exactly 6 bytes in length.

					Example: [01 02 03 04 05 06]

- qcom,use-otp-profile:			Specify this flag to avoid RAM loading

					any battery profile.

drivers/power/qpnp-fg.c

+24 −4
Original line number Diff line number Diff line
@@ -208,6 +208,7 @@ enum fg_mem_if_irq { 
	FG_MEM_IF_IRQ_COUNT,

};



#define THERMAL_COEFF_N_BYTES		6

struct fg_chip {

	struct device		*dev;

	struct spmi_device	*spmi;
@@ -235,6 +236,8 @@ struct fg_chip { 
	struct delayed_work	update_jeita_setting;

	struct delayed_work	update_sram_data;

	char			*batt_profile;

	u8			thermal_coefficients[THERMAL_COEFF_N_BYTES];

	bool			use_thermal_coefficients;

	unsigned int		batt_profile_len;

	const char		*batt_type;

	unsigned long		last_sram_update_time;
@@ -1637,12 +1640,19 @@ static void batt_profile_init(struct work_struct *work) 


static int fg_of_init(struct fg_chip *chip)

{

	int rc = 0, sense_type;

	int rc = 0, sense_type, len = 0;

	const char *data;



	OF_READ_SETTING(FG_MEM_SOFT_HOT, "warm-bat-decidegc", rc, 1);

	OF_READ_SETTING(FG_MEM_SOFT_COLD, "cool-bat-decidegc", rc, 1);

	OF_READ_SETTING(FG_MEM_HARD_HOT, "hot-bat-decidegc", rc, 1);

	OF_READ_SETTING(FG_MEM_HARD_COLD, "cold-bat-decidegc", rc, 1);

	data = of_get_property(chip->spmi->dev.of_node,

			"qcom,thermal-coefficients", &len);

	if (data && len == THERMAL_COEFF_N_BYTES) {

		memcpy(chip->thermal_coefficients, data, len);

		chip->use_thermal_coefficients = true;

	}



	/* Get the use-otp-profile property */

	chip->use_otp_profile = of_property_read_bool(
@@ -2255,6 +2265,8 @@ static int soc_to_setpoint(int soc) 
#define BATT_TEMP_CNTRL_MASK	0x0F

#define BATT_TEMP_ON		0x0E

#define BATT_TEMP_OFF		0x01

#define THERMAL_COEFF_ADDR	0x444

#define THERMAL_COEFF_OFFSET	0x2

static int fg_hw_init(struct fg_chip *chip)

{

	int rc = 0;
@@ -2286,6 +2298,14 @@ static int fg_hw_init(struct fg_chip *chip) 
		return rc;

	}



	if (chip->use_thermal_coefficients) {

		fg_mem_write(chip, chip->thermal_coefficients,

			THERMAL_COEFF_ADDR, 2,

			THERMAL_COEFF_OFFSET, 0);

		fg_mem_write(chip, chip->thermal_coefficients + 2,

			THERMAL_COEFF_ADDR + 4, 4, 0, 0);

	}



	return 0;

}
@@ -2435,15 +2455,15 @@ static int fg_probe(struct spmi_device *spmi) 
	if (chip->last_sram_update_time == 0)

		update_sram_data(&chip->update_sram_data.work);



	/* release memory access if necessary */

	fg_release_access_if_necessary(chip);



	rc = fg_hw_init(chip);

	if (rc) {

		pr_err("failed to hw init rc = %d\n", rc);

		goto cancel_jeita_work;

	}



	/* release memory access if necessary */

	fg_release_access_if_necessary(chip);



	if (!chip->use_otp_profile)

		schedule_work(&chip->batt_profile_init);